Improved M-part timing synchronization and frequency offset method based on CAZAC sequence

The invention discloses an M-part timing synchronization and frequency offset method based on a CAZAC sequence, and the method comprises the steps: dividing the CAZAC sequence to obtain a CAZAC leader sequence meeting conjugate antisymmetry, obtaining a CAZAC training sequence, and obtaining a receiving signal according to the CAZAC training sequence; constructing each timing metric matrix by using a received signal and a CAZAC training sequence, and screening a symbol timing estimation value; performing weighted summation on the symbol timing estimation value to obtain a timing deviation estimation value; meanwhile, according to symbol timing estimation values and conjugate antisymmetry between adjacent symbols, an integer frequency offset estimation value and a decimal frequency offset estimation value are obtained, and finally timing synchronization and frequency offset estimation are conducted through the decimal frequency offset estimation value, the integer frequency offset estimation value and the symb